The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 2004
Filed:
Sep. 19, 2002
Kanji Natori, Fujimi-machi, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
The invention provides high speed access when shifting to an active mode from a standby mode, in particular immediately after shifting to a read, and reduces the current consumption at the time of standby. A strong charge pump generates 5.0V and a power supply voltage of 8.0V. The power supply voltage is supplied to constant voltage circuits. The constant voltage circuits generate voltages according to the respective read, program and erase operation modes. The strong charge pump that operates in active modes consumes a large amount of current. In contrast, the weak charge pump operates with a low current consumption and generates a steppe up power supply voltage in the standby mode. With the power supply voltage that is generated by the weak charge pump in the standby mode, a high speed access is possible when shifting from the standby mode to the active mode, and in particular, immediately after shifting to a read mode. Also, the current consumption in the standby mode can be substantially reduced.